<table width="100%" cellpadding="0" cellspacing="1" border="0">
  <% @zone.cities.each do |city| %>
    <% if city.city_num % 7 == 1 %><tr><% end %>
      <td style="width: 10px; height: 10px; border: solid 1px #000;"><%= link_to city.id, :controller => 'city', :action => 'show', :id => city.id %></td>
    <% if city.city_num % 7 == 0 %></tr><% end %>
  <% end %>
</table>